Hello,

I am trying to set up Dovecot 2.0.9 on Fedora 14. The problem I would like
to ask for resolution is that IMAP is not working when connecting to the
server from another network.

More precisely:

• POP3 is working entirely OK,
• IMAP is working OK when clients are connecting using local network
  addresses, like 192.168.0.100,
• when a client connects from outside, thus using remote IP address, or
  even from the server itself using the remote IP address of the server, the
  following happens: the client correctly connects, but the server sends no
  greeting (neither the configured login_greeting nor the server IMAP
  capabilities) and does not respond to the commands. In the server log, I
  get the following record a while after trying to connect (and actually
  trying to login): Jul 08 23:24:16 imap-login: Info: Disconnected: Inactivity (no auth
  attempts): rip=<remote-server-address>, lip=192.168.0.100

Both routing and firewall are OK. The client really connects to dovecot
(hence the log message), as seen from a telnet session: Trying a.b.c.d... Connected to example.tld (a.b.c.d). Escape character is '^]'. (and then nothing else)

The most confusing for me is the fact that POP3 is configured quite the
same and works fine, as well as IMAP on the local network. I tried to
change address in the inet_listener imap configuration, but if a wrong
address setting was the cause, the client would not get connected at all.

As I have spent a pretty long time unsuccessfully searching for a cause, I
am asking for some help.

Thanks for your time, Ondrej Bouda

dovecot -n output follows:

2.0.9: /etc/dovecot/dovecot.conf

OS: Linux 2.6.35.11-83.fc14.x86_64 x86_64 Fedora release 14 (Laughlin)

ext4 auth_mechanisms = plain login cram-md5 digest-md5 ntlm disable_plaintext_auth = no first_valid_gid = 502 first_valid_uid = 502 last_valid_gid = 502 last_valid_uid = 502 log_path = /var/log/dovecot login_greeting = Welcome mail_location = maildir:/var/mail/virtual/%d/%n passdb { args = scheme=plain username_format=%u /etc/dovecot/passwd driver = passwd-file } protocols = imap pop3 service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } user = dovecot-auth } service imap-login { inet_listener imap { address = * port = 143 } } service pop3-login { inet_listener pop3 { address = * port = 110 } } ssl = no userdb { args = username_format=%u /etc/dovecot/passwd driver = passwd-file } protocol pop3 { pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv }